Title: Oxide acid-base reactions relating to the inhibition of vanadium attack on REY zeolite catalysts
Abstract: Certain materials, especially Sn, passivate the rare earth-exchanged Y zeolite (REY) used in petrochemical fluid-cracking catalysts against vanadium degradation caused by V impurities in the feed oil. The mechanism of passivation was investigated here from the standpoint of high-temperature oxide acid-base reaction; i.e., where the controlling factors were considered to be Lewis acid-base reactions between V205, the RE oxides, SnO2, etc. Molten salt tests at 680°C showed SnO2, presumably because of its acidic nature, to be essentially nonreactive with V205 or Na2OV2O5 compounds. A hypothesis was developed to explain how the passivation effect by Sn might result from the unique resistivity of SnO2 to reaction with V205.
Publication Year: 1991
Publication Date: 1991-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 8
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